What do you limp?

[ QUOTE ]
From UTG in the early levels I generally open raise with any pocket pair that I would call a raise with had I open limped instead. In general, this means 77 and up. I'll usually fold 66 and lower unless the table has shown a willingness to let a bunch of limpers see a cheap flop.

Once in a great while, if it's too early for the table to have a read on me, I'll open limp AA from UTG.

[/ QUOTE ]
If you're going to open limp AA, don't you also need to open limp other holding? Otherwise, they'll always know you have AA when you open limp.

I understand that you clarified that you might do this only when thetable has no reads. But, I do find it curious that no one else has mentioned open limping AA; I see it a lot.